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Mineralogy and Petrology

, Volume 96, Issue 3–4, pp 163–175 | Cite as

From emplacement to unroofing: thermal history of the Jiazishan gabbro, Sulu UHP terrane, China

  • W. Siebel
  • M. Danišík
  • F. Chen
Origianl Paper

Abstract

On the eastern extremity of the Jiaodong peninsula, China, shoshonitic magmas have been injected into the supracrustal rocks of the Sulu ultra-high pressure (UHP) terrane during the crustal exhumation phase. These granitoids (collectively termed the Shidao igneous complex or Jiazishan alkaline complex) show geochemical and isotopic signatures of an enriched subcontinental lithospheric mantle and intruded soon after the subducted Yangtze crust had reached peak metamorphic pressure conditions (240–220 Ma). We have applied various geochronometers to an alkali-gabbro sample from the Jiazishan pluton and the results allow reconstruction of the Triassic-to-present thermal history. Initial rapid cooling of the gabbro at crustal depths is indicated by the close agreement between the Sm-Nd mineral isochron age (228 ± 36 Ma) and the Rb-Sr biotite age (207 ± 1) Ma. This interpretation is confirmed by previously published U-Pb zircon ages (225–209 Ma), and 40Ar/39Ar amphibole and K-feldspar ages (∼214 Ma) from the Jiazishan syenites. A titanite fission-track age of 166 ± 8 Ma (closure temperature range 285–240°C) records widespread Jurassic magmatism in the Jiaodong peninsula, indicating that the gabbro reached upper crustal levels before it was reheated by nearby Jurassic plutons. A subsequent cooling and reheating event is indicated by an apatite fission-track age of 106 ± 6 Ma which coincides with the emplacement of the adjacent Weideshan pluton (108 ± 2 Ma) and postdates a period of regional lithospheric thinning beneath eastern China. A period of slow cooling (or thermal stability) from late Cretaceous to early Tertiary, documented by an apatite (U-Th)/He age of 39 ± 5 Ma, was followed by a final stage of more enhanced cooling since the late Eocene. Results of this work imply that the eastern Sulu terrane has experienced a complex cooling and reheating history. Our data are consistent with a model of initial rapid cooling (sudden exhumation) of the UHP terrane, driven by the release of buoyancy forces, followed by two progressively slower cooling intervals (both after renewed crustal reheating) during the Jurassic and Cretaceous.

Keywords

Apatite Titanite Lithospheric Mantle North China Craton Vienna Standard Mean Ocean Water 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to Gisela Bartholomä, Elmar Reitter, Bernd Steinhilber, Gabriele Stoscheck and Heiner Taubald for analytical help during sample preparation and isotope analyses and to Noreen Evans for U-Th analyses and English language corrections.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Institute of GeosciencesUniversity of TübingenTübingenGermany
  2. 2.John de Laeter Centre of Mass Spectrometry, Department of Applied GeologyCurtin University of TechnologyPerthAustralia
  3. 3.Key Laboratory of Mineral Resources, Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  4. 4.Key Laboratory of Crust-Mantle Materials and Environments, School of Earth SciencesUniversity of Science and TechnologyHefeiChina

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